Page 1
MA-700PrincipleandServicing
1.Unitcircuitprinciple
MA700isamiddle-levelactivespeaker,whichiscomposedofasubwooferspeaker,twofront
satellitespeakers,twosurroundspeakersandacentrespeakerandwithexcellentsoundeffect.Ithas
thefollowingfeatures:
2.1/5.1CHoutput; ¡ô
¡ô
¡ôBuilt-in5CHpoweramplifying,adaptabletoAC-3/DTSandstereomusicreplay;
With6CHvolumecontrolandseparatelevelcontrol,andwithtoneadjustmentfunction.
Theplayerincludesinputboard,outputboard,poweramplifierboardandcontrolpanel,inwhich,
inputboardandoutputboardarecomprisedofseveralterminals;themainpartispoweramplifierboard,
control,amplifyingpartoftheplayerandpowersupplyareallincludedonit.PCBboardcomposition
figureoftheplayerisshownasthefollowingfigure1.1.1:(1)PCBboardcompositionfigureoftheplayer
OUTPUTBOARD ~14V0 ~14VXP3XS3 XS21.2.3.XS4XP4SL R L
SL R L GND
GND
C
SRGND
GND
C
SR
1. 1. 1.1.
2. 2. 2.2.
3.
3. 3. 4.4. 3.GNDL R
GNDL R SW
SR
SL
CSW
SR
SL
C
1. 1. 1.1.
2. 2. 2.2.
3.
3. 3. 4.4. 3.XS1
XP2SWSPEAKERSW INPUTBOARDPOWERAMPLIFYINGBOARD
FRONTPANEL'SBOARDCIRCUITCONNECTIONDIAGRAM
Figure1.1.1PCBboardcompositionfigureoftheplayer
-1-
